Year Counter (Ryrcnt) - Hitachi SH7750 Hardware Manual

Bit:
Initial value:
R/W:
11.2.8

Year Counter (RYRCNT)

RYRCNT is a 16-bit readable/writable register used as a counter for setting and counting the
BCD-coded year value in the RTC. It counts on the carry generated once per year by the month
counter.
The setting range is decimal 0000 to 9999. The RTC will not operate normally if any other value
is set. Write processing should be performed after stopping the count with the START bit in
RCR2, or by using the carry flag.
RYRCNT is not initialized by a power-on or manual reset, or in standby mode.
Bit:
Initial value:
Undefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined
R/W:
Bit:
Initial value:
Undefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined
R/W:
7 6
— — —
0 0
R R
15 14 13
1000-year units
R/W R/W R/W
7 6
10-year units
R/W R/W R/W
5 4 3
0-month
unit
0
Undefined Undefined Undefined Undefined Undefined
R R/W R/W
12 11
R/W R/W
5 4 3
R/W R/W
2 1
1-month units
R/W R/W
10 9
100-year units
R/W R/W
2 1
1-year units
R/W R/W
Rev. 6.0, 07/02, page 275 of 986
0
R/W
8
R/W
0
R/W